Jquery如何在数组中按属性找到对象 [英] Jquery how to find an Object by attribute in an Array

问题描述

假设我有一个目的对象数组：

  //目的对象数组：
 var purposeObjects = [
 {purpose：daily}，
 {purpose：weekly}，
 {purpose：monthly} 
] 
  

（为了简单起见，我省略了其他属性）

现在我想有一个方法，如果找到匹配的目的名称，返回一个特定的对象。

这不工作：

  function findPurpose 
 return $ .grep（purposeObjects，function（）{
 return this.purpose == purposeName; 
}）; 
}; 
 
 findPurpose（daily）; 
  

但它实际上返回一个空数组：

  [] 
  

我使用的是JQuery 1.5.2。我也试过$ .each（），但没有运气。
显然，大多数JQuery方法是为使用DOM元素而设计的（例如 filter（）。

错误是你不能使用这

code>在grep，但你必须使用对元素的引用。这工作：

  function findPurpose ）{
 return $ .grep（purposeObjects，function（n，i）{
 return n.purpose == purposeName; 
}）; 
}; 
 
 findPurpose（daily）; 
  

返回：

b $ b

  [Object {purpose =daily}] 
  

Given I have an array of "purpose" objects:

//array of purpose objects:
var purposeObjects = [
    {purpose: "daily"},
    {purpose: "weekly"},
    {purpose: "monthly"}
];

(for simplicity i am omitting other attributes)

Now I want to have a method that returns a specific one of the objects if a matching purpose name is found.

This is not working:

function findPurpose(purposeName){
    return $.grep(purposeObjects, function(){
      return this.purpose == purposeName;
    });
};

findPurpose("daily");

but it actually returns an empty array:

[]

I am using JQuery 1.5.2. I have also tried with $.each() but with no luck. Apparently, most JQuery methods are designed for usage with DOM elements (such as filter().

Any ideas on how to achieve this?

解决方案

The error was that you cannot use this in the grep, but you must use a reference to the element. This works:

function findPurpose(purposeName){
    return $.grep(purposeObjects, function(n, i){
      return n.purpose == purposeName;
    });
};

findPurpose("daily");

returns:

[Object { purpose="daily"}]

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